One installer per system, with every plugin in it. The first time you open one, type your email address to start a 14-day trial of them all; a licence key unlocks it for good. Already bought? Enter your key when the plugin asks.
macOS
macOS 11 or later. Universal: Apple Silicon and Intel.Alpine, Artifact, Modulation, Delay, Reverb, Grains, Steps and Steps Free
Windows 10 or later, 64-bit.Windows may say “Windows protected your PC”: choose More info, then Run anyway. The installer is signed by Paweł Witkowski.Alpine, Artifact, Modulation, Delay, Reverb, Grains, Steps and Steps Free
Unzip the download (right-click > Extract All), close your DAW and run the .exe from the extracted folder.
If Windows says “Windows protected your PC”, choose More info, then Run anyway. The installer is signed; Windows warns about any program it has not seen many times yet.
Open your DAW and rescan its plugins. They are in C:\Program Files\Common Files\VST3.
macOS
Unzip the download, close your DAW and open the .pkg.
Open your DAW. Logic Pro finds the plugins as it starts; in Ableton Live, Settings > Plug-Ins > Rescan if they do not appear.
Steps, Steps FreeThey play your synth over MIDI and make no sound of their own: put them on a MIDI track, before the synth. The manual has the routing for each DAW.